/*
 * @Author: DONGDONG
 * @Date: 2022-01-19 16:28:24
 * @LastEditTime: 2022-01-19 17:50:56
 * @LastEditors: DONGDONG
 * @FilePath: \lagoufed-e-task\part1\fed-e-task-01-01\code\support.js
 */
class Container {
	static of(value) {
		return new Container(value)
	}

	constructor(value) {
		this._value = value
	}

	map(fn) {
		return Container.of(fn(this._value))
	}
}

class Maybe {
	static of(value) {
		return new Maybe(value)
	}

	constructor(value) {
		this._value = value
	}

	map(fn) {
		return this.isNothing() ? this : Maybe.of(fn(this._value))
	}

	isNothing() {
		return this._value === null || this._value === undefined
	}
}

module.exports = { Maybe, Container }
